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Yes but if it was optional, you would have people saying that players SHOULD use it and it could easily cause arguments. Its like the old argument about if a person should resign a game when the outcome is an obvious loss for them, or should they play to the end.
Many people get irate if a person doesn't resign when they'd like them to. It would be the same here, if a person for instance was stuck on the bar in backgammon, but wished to see their opponents moves, they would not use an auto feature.. and their opponent would say 'can't you use it?'... It could cause a lot of tension. IMHO
Autopass would not stop one from seeing the opponents moves. Of course the moves would be recorded as usual and they could be seen in the game notation. There should be a automated message sent to player after autopasses telling you had to pass and instructions on how to check what happened since your last move. I can't see how that could be very confusing for anyone.